3 p.m. Alan Dershowitz discusses his book "Finding Jefferson: A Lost Letter, a Remarkable Discovery, and the First Amendment in an Age of Terrorism"; Brooklyn College Library’s Tanger Center, 2900 Bedford Ave. Letter will be displayed.

3 p.m. Press conference opening the National Institute for Reproductive Health’s "Urban Initiative for Reproductive Health Summit" in the Blue Room at City Hall; at 6 p.m. there’s a welcome reception at Gracie Mansion.

5:30 p.m. Discussion book signing with Ishmael Beah, author of "A Long Way Gone: Memoirs of a Boy Soldier"; Pace University’s Michael Schimmel Center for the Arts theater, Spruce Street.

7:30 p.m. Joe Addabbo will discuss his State Senate race at a joint meeting of the DFNYC‘s Astoria and Sunnyside meetings, at 39-24 Queens Boulevard, in Queens.

7:30 p.m. The North Shore Republican Club will meet at Casa Milla restaurant, 461 Port Richmond Ave., Port Richmond. Cost is $35 per person, with full dinner and a cash bar. Call 718-981-4530 for information.